URGENT ! ! ! ! Components Microsoft Exel Chart

I would like to change value in object Excel.

I make graph with excel and I would like to change value on sheet1 in Excel.

My graph refer to sheet1 and I wont to modify graph.

Name = Chart1

How can Help me ?

Sorry for my english.
Thanks
Redg

if you posted some code that we could look at, we could probably help you.